在同一个数组中使用相同的Key值

Question

如何正确编写此代码？第四行，我想在同一个数组中使用两个第一个键的值。

$pixel_percents = array(
    "complete"=>.5 * 768,
    "wip"=>round(.2 * 768, 0, PHP_ROUND_HALF_DOWN),
    "remain"=>$pixel_percents["complete"] - $pixel_percents["wip"]
);

Answer 1

在

之后再做

$pixel_percents = array(
    "complete"=>.5 * 768,
    "wip"=>round(.2 * 768, 0, PHP_ROUND_HALF_DOWN),
);
$pixel_percents['remain'] = $pixel_percents['complete'] - $pixel_percents['wip'];

Answer 2

$pixel_percents = array();
$pixel_percents["complete"] = .5 * 768;
$pixel_percents["wip"] = round(.2 * 768, 0, PHP_ROUND_HALF_DOWN);
$pixel_percents["remain"] = $pixel_percents["complete"] - $pixel_percents["wip"];